From 2c799aaf552425752df4436c975a6ba4fd43632d Mon Sep 17 00:00:00 2001
From: woegster <tobi@woegster.at>
Date: Sun, 17 Aug 2025 01:46:29 +0200
Subject: [PATCH 1/2] add support for utf8 expressions

---
 tinyexpr.c | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/tinyexpr.c b/tinyexpr.c
index 176e8d0..efb2fdd 100755
--- a/tinyexpr.c
+++ b/tinyexpr.c
@@ -235,6 +235,26 @@ static double divide(double a, double b) {return a / b;}
 static double negate(double a) {return -a;}
 static double comma(double a, double b) {(void)a; return b;}
 
+int is_not_special_token(char c)
+{
+  switch (c) {
+  case '+':
+  case '-':
+  case '*':
+  case '/':
+  case '^':
+  case '%':
+  case '(':
+  case ')':
+  case ',':
+  case ' ':
+  case '\t':
+  case '\n':
+  case '\r':
+    return 0;
+  }
+  return 1;
+}
 
 void next_token(state *s) {
     s->type = TOK_NULL;
@@ -252,10 +272,10 @@ void next_token(state *s) {
             s->type = TOK_NUMBER;
         } else {
             /* Look for a variable or builtin function call. */
-            if (isalpha(s->next[0])) {
+            if (is_not_special_token(s->next[0])) {
                 const char *start;
                 start = s->next;
-                while (isalpha(s->next[0]) || isdigit(s->next[0]) || (s->next[0] == '_')) s->next++;
+                while (is_not_special_token(s->next[0]) || isdigit(s->next[0]) || (s->next[0] == '_')) s->next++;
                 
                 const te_variable *var = find_lookup(s, start, s->next - start);
                 if (!var) var = find_builtin(start, s->next - start);

From ce28672eaea51097be45ef73f9c603e95f7e11d2 Mon Sep 17 00:00:00 2001
From: woegster <tobi@woegster.at>
Date: Sun, 17 Aug 2025 04:25:10 +0200
Subject: [PATCH 2/2] correct null handling

---
 tinyexpr.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tinyexpr.c b/tinyexpr.c
index efb2fdd..2074786 100755
--- a/tinyexpr.c
+++ b/tinyexpr.c
@@ -251,6 +251,7 @@ int is_not_special_token(char c)
   case '\t':
   case '\n':
   case '\r':
+  case '\0':
     return 0;
   }
   return 1;